[old school tie] See: [OLD BOY NETWORK], [OLD COLLEGE TRY].

[old story] {n.} An everyday occurrence; something that often happens. * […]

[old world] {n. phr.} Europe, the continent; a continental manner. * […]

[old-timer] {n.} An old person who remembers bygone days, matters, and […]

[olive branch] {n. phr.} An overture; a symbol of peace. * […]

[OMG] Exclamation, "Oh my God/goodness!"

[OMW] "On my way"

[on a dime] {adv. phr.}, {informal} In a very small space. […]

[on a limb] See: [OUT ON A LIMB].

[on a pedestal] {adv. phr.} Lovingly honored and cared for. * […]