endlong UK /ˈɛndlɒŋ/US /ˈɛndˌlɔŋ/adverb 3preposition 1 adverb3 •From end to end. •Continuously.The rest he leaves in ground: So takes in hond To seeke her endlong both by sea and lond — 1590 •On end. preposition1 •(no longer used) Along (as opposed to across), from end to end of.