(literally) to sit at a table; (figuratively) to establish oneself firmly in a situation—‘to put one’s feet under the same table with somebody’: (literally) to sit at a table with somebody; (figuratively) to associate oneself with somebody
a person who now preserves the interests that he or she previously attacked—UK, 19th century—but the notion occurred in Chaucer’s Physician’s Tale and ‘the greatest deer-stealers make the best park-keepers’ in The Church-History of Britain (1655)
1747—a small outlay or risk ventured in the hope or expectation of a significant return—a metaphor from fishing, in which sprats are used as bait to catch larger fish—in early use with the words ‘salmon’ and ‘herring’ instead of ‘mackerel’
said to console a child choking over his or her food—UK, obsolete—first recorded in A Complete Collection of Genteel and Ingenious Conversation (1738), by Jonathan Swift
means that, in a specific situation, a person will be blamed or considered wrong no matter what he or she does—USA, 1817—originally used in Christian contexts
something that hastens, or contributes to, the end of the person or thing referred to—USA, 1805 in an open letter by the English political writer Thomas Paine
1808, as ‘to talk a horse’s hind leg off’—‘[animal’s] hind leg off’ is probably a hyperbolic extension of ‘to talk’, emphasising the speaker’s persistence or eloquence
‘Backward in coming forward’ means ‘reluctant, shy to do something’. The earliest instances that I have found are about funds set up in order to provide aid to soldiers wounded during the Napoleonic Wars.