Etymology
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hypothecate (v.)

1680s, "pledge (something) without giving up control of it; pawn; mortgage," from hypothecat-, past-participle stem of Medieval Latin hypothecare, from Late Latin hypotheca "a pledge," from Greek hypothēkē "a deposit, pledge, mortgage," from hypo- "beneath, under" (see hypo-) + tithenai "to put, to place," from reduplicated form of PIE root *dhe- "to set, put." Related: Hypothecated; hypothecating; hypothecation; hypothecary.

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Definitions of hypothecate

hypothecate (v.)
pledge without delivery or title of possession;
hypothecate (v.)
to believe especially on uncertain or tentative grounds;
From wordnet.princeton.edu