This is the verse translation, not a definition of the individual word.
If Allah brings you back to a group of them and they ask your permission to go forth with you, say, “You will never go forth with me, nor will you ever fight an enemy with me. You were content to remain behind the first time, so now stay with those who remained behind[1].”
Source
[1] It is used here to impart a derogatory sense because of their incapacity.