rub /ˈrʌb/
 摩擦,困難,障礙,難點,磨損處(vt.)擦,搓,摩擦,惹怒(vi.)摩擦,擦破
 rub /ˈrəb/ 名詞
 摩擦,摩擦音
 Rub v. t. [imp. & p. p. Rubbed p. pr. & vb. n. Rubbing.]
 1. To subject (a body) to the action of something moving over its surface with pressure and friction, especially to the action of something moving back and forth; as, to rub the flesh with the hand; to rub wood with sandpaper.
    It shall be expedient, after that body is cleaned, to rub the body with a coarse linen cloth.   --Sir T. Elyot.
 2. To move over the surface of (a body) with pressure and friction; to graze; to chafe; as, the boat rubs the ground.
 3. To cause (a body) to move with pressure and friction along a surface; as, to rub the hand over the body.
    Two bones rubbed hard against one another.   --Arbuthnot.
 4. To spread a substance thinly over; to smear.
 The smoothed plank, . . .
 New rubbed with balm.   --Milton.
 5. To scour; to burnish; to polish; to brighten; to cleanse; -- often with up or over; as, to rub up silver.
    The whole business of our redemption is to rub over the defaced copy of the creation.   --South.
 6. To hinder; to cross; to thwart. [R.]
 'T is the duke's pleasure,
 Whose disposition, all the world well knows,
 Will not be rubbed nor stopped.   --Shak.
 To rub down. (a) To clean by rubbing; to comb or curry; as, to down a horse. (b) To reduce or remove by rubbing; as, to rub down the rough points.
 To rub off, to clean anything by rubbing; to separate by friction; as, to rub off rust.
 To rub out, to remove or separate by friction; to erase; to obliterate; as, to rub out a mark or letter; to rub out a stain.
 To rub up. (a) To burnish; to polish; to clean. (b) To excite; to awaken; to rouse to action; as, to rub up the memory.
 Rub, v. i.
 1. To move along the surface of a body with pressure; to grate; as, a wheel rubs against the gatepost.
 2. To fret; to chafe; as, to rub upon a sore.
 3. To move or pass with difficulty; as, to rub through woods, as huntsmen; to rub through the world.
 To rub along or on, to go on with difficulty; as, they manage, with strict economy, to rub along. [Colloq.]
 Rub, n.
 1. The act of rubbing; friction.
 2. That which rubs; that which tends to hinder or obstruct motion or progress; hindrance; obstruction, an impediment; especially, a difficulty or obstruction hard to overcome; a pinch.
    Every rub is smoothed on our way.   --Shak.
    To sleep, perchance to dream; ay, there's the rub.   --Shak.
    Upon this rub, the English ambassadors thought fit to demur.   --Hayward.
    One knows not, certainly, what other rubs might have been ordained for us by a wise Providence.   --W. Besant.
 3. Inequality of surface, as of the ground in the game of bowls; unevenness.
 4. Something grating to the feelings; sarcasm; joke; as, a hard rub.
 5. Imperfection; failing; fault. [Obs.]
 6. A chance. [Obs.]
    Flight shall leave no Greek a rub.   --Chapman.
 7. A stone, commonly flat, used to sharpen cutting tools; a whetstone; -- called also rubstone.
 Rub iron, an iron guard on a wagon body, against which a wheel rubs when cramped too much.
 Rub of the green Golf, anything happening to a ball in motion, such as its being deflected or stopped by any agency outside the match, or by the fore caddie.
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 rub
      n 1: an unforeseen obstacle [syn: hang-up, hitch, snag]
      2: the act of rubbing or wiping; "he gave the hood a quick rub"
         [syn: wipe]
      v 1: move over something with pressure; "rub my hands"; "rub oil
           into her skin"
      2: cause friction; "my sweater scratches" [syn: fray, fret,
          chafe, scratch]
      3: scrape or rub as if to relieve itching; "Don't scratch your
         insect bites!" [syn: scratch, itch]
      [also: rubbing, rubbed]