con·strain /kənˈstren/
  (vt.)強迫,勉強,驅使
  Con·strain v. t. [imp. & p. p. Constrained p. pr. & vb. n. Constraining.]
  1. To secure by bonds; to chain; to bond or confine; to hold tightly; to constringe.
  He binds in chains
  The drowsy prophet, and his limbs constrains.   --Dryden.
     When winter frosts constrain the fields with cold.   --Dryden.
  2. To bring into a narrow compass; to compress.
     How the strait stays the slender waist constrain.   --Gay.
  3. To hold back by force; to restrain; to repress.
     My sire in caves constrains the winds.   --Dryden.
  4. To compel; to force; to necessitate; to oblige.
     The love of Christ constraineth us.   --2. Cor. v. 14.
     I was constrained to appeal unto Cæsar.   --Acts xxviii. 19.
  5. To violate; to ravish. [Obs.]
  6. To produce in such a manner as to give an unnatural effect; as, a constrained voice.
  Syn: -- To compel; force; drive; impel; urge; press.
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  constrain
       v 1: hold back [syn: restrain, encumber, cumber]
       2: restrict; "Tighten the rules"; "stiffen the regulations"
          [syn: stiffen, tighten, tighten up]