n.: have got to, can't avoid, can't help it, have no choice or option but to, cannot but, have no choicebut to, have got, have to; have no choicebut to; cannot but, owe it to oneself, be obliged to do sth., under the necessity (of doing sth.), cannot help but, cannot help (doing), under [in] constraint, be constrained to do sth., be compelled to (do), cannot choose but, be obliged to (do)