[いちど(一度)(P);ひとたび, ichido ( ichido )(P); hitotabi] (n-adv) (1) once; one time; on one occasion; (2) (ひとたび only) temporarily; for a moment; (3) (いちど only) one degree; one tone; one musical interval; (P)#1501
[いっすんのこういんかろんずべからず, issunnokouinkaronzubekarazu] (exp) (id) (arch) There isn't a moment to be wasted; Every moment is precious; make hay while the sun shines