Strong's Definition
perhaps from 1158 (in the sense of asking); properly, a request; used only adverbially (always with "my Lord"); Oh that!; with leave, or if it please
KJV Usage: alas, O, oh
STEPBible — Tyndale Abridged Hebrew Lexicon
בִּי (bi) — please. 1) if it please, pray excuse me, excuse me please 1a) used to introduce an entreaty or request
UBS Dictionary of Biblical Hebrew
UBS Dictionary of Biblical Hebrew © United Bible Societies, licensed CC BY-SA 4.0.
Brown-Driver-Briggs Hebrew Lexicon
בִּי part. of entreaty, craving permission to address a superior, I pray, excuse me base