'bail' (and forms such as 'bailed') originates from Old French 'baillier' / 'bailer' meaning 'to have charge of, to hand over' (related to the noun 'bail' and to 'bailiff').

'bail' passed into Middle English as 'bailen'/'baillen' with senses related to custody, handing over, and charge; over time the word developed several specialized senses (legal security, removing water, abandoning) and became the modern English 'bail' and past form 'bailed'.

Initially it referred to having charge or custody ('to hold or deliver into custody'); over time it evolved into legal senses (security for release), physical senses (to remove water), and informal senses (to abandon or to rescue financially).