プログレッシブ和英中辞典(第4版)の解説
たつ【▲経つ】
pass (by); go by
彼がここに移り住んでから３年たった
「Three years have passed [It has been three years] since he came here (to live).
時がたつにつれて痛みは消えた
The pain disappeared as time went by.
時のたつのは実に早い
How time flies!
話に夢中になって時のたつのを忘れた
We were so absorbed in talking that we almost 「forgot the passage [lost track] of time.
10年たてば
ten years from now／in ten years
５年もたたないうちに
in less than five years／within five years