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The Collaborative International Dictionary
Preengage

Preengage \Pre`["e]n*gage"\, v. t. [imp. & p. p. Pre["e]ngaged; p. pr. & vb. n. Pre["e]ngaging.] To engage by previous contract; to bind or attach previously; to preoccupy.

But he was pre["e]ngaged by former ties.
--Dryden.

Wiktionary
preengage

vb. (context transitive English) To engage by previous contract; to bind or attach previously.