A Quick and Simple Dictionary

enforce

1. Verb.  (obsolete, transitive) To strengthen (a castle, town etc.) with extra troops, fortifications etc. (defdate, 14th-18th c.) .
2. Verb.  (obsolete, transitive) To intensify, make stronger, add force to. (defdate, 14th-18th c.) .
3. Verb.  (obsolete, reflexive) To exert oneself, to try hard. (defdate, 14th-17th c.) .
4. Verb.  To give strength or force to; to affirm, to emphasize. (defdate, from 15th c.) .
5. Verb.  (archaic) To compel, oblige (someone or something); to force. (defdate, from 16th c.) .
6. Verb.  To keep up, impose or bring into effect something, not necessarily by force. (defdate, from 17th c.) .