ETYM Pref. re- + gain: cf. French regagner.
To gain anew; to get again; to recover, as what has escaped or been lost; to reach again. SYN. To recover; reobtain; repossess; retrieve.

1. To bring back something which was lost or which had been thrown away.
2. To recover.
3. To be capable of retrieving; said of dogs.