under-side

n [sing] side or surface that is underneath; bottom 下侧; 下部表面; 底面; 底部: His shot hit the under-side of the bar, ie the one across the goal-posts. 他射门击中了横梁的下侧.

undaunted, undeceive, undecided, undeclared, undefended, undefined, undemanding, undemonstrative, undeniable, undeniably, under, under arms, under control, under the charge of, under the heel of, under the order of, under way, under-, under-secretary, under-sexed, underachieve, underachiever, underact, underarm, underbelly, underbid, underbrush, undercarriage, undercharge, underclothes, undercoat, undercover, undercurrent, undercut, underdeveloped, underdog, underdone, underestimate, underexpose, underexposure,