tuck

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tuck

1. the part of a vessel where the after ends of the planking or plating meet at the sternpost
2. a position of the body in certain dives in which the legs are bent with the knees drawn up against the chest and tightly clasped
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

tuck

A recess in a horizontal mortar joint which is raked out to provide for tuck pointing.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Then there was cycling's Flying Scotsman Graham Obree, penalised by the authorities, not for having a bike constructed out of washing machine parts but for adopting, wait for it, an illegal "tuck position" when riding it.
For beginners, I recommend cat tuck position to initially experience the belly lock.