under compulsion

See: bound
References in classic literature ?
Highcamp was a plain, bald-headed man, who only talked under compulsion.
They got out of the way, gave trail to the grown dogs, and gave up meat to them under compulsion.
He drank wine only on very rare occasions, and then under compulsion.
Moreover, a most wretched fiddle played within; a fiddle so unutterably vile, that one lean long-bodied cur, with a better ear than the rest, found himself under compulsion at intervals to go round the corner and howl.
A quarter of wealthy Britons felt under compulsion to leave pounds 500,000 or more, while 65% said they were happy for those to whom they left money to spend it on whatever they wanted.