To abandon (someone or something)
To admit defeat, capitulate
Become fully taken over by a certain quality, activity, trait, &c.
To relinquish (something)
To execute a trade on behalf of another broker.
To stop or quit (an activity, etc.)
To surrender (someone or something)
To lose hope concerning (someone or something)
To abandon somebody; especially, to abandon somebody and leave him or her in a difficult situation.