Full explanation — Limp
A limp is a preflop entry into the pot by simply calling the amount of the big blind rather than raising. In most modern game formats, limping is considered a weak strategy because it fails to build a pot with strong holdings and surrenders the betting initiative to later players. An "over-limp" refers to limping after another player has already limped ahead of you, which is sometimes reasonable with speculative hands in multiway pots.