smell (n.) Look up smell at Dictionary.com
"odor, aroma, stench," late 12c.; see smell (v.). Ousted Old English stenc (see stench) in most senses.
smell (v.) Look up smell at Dictionary.com
late 12c., "emit or perceive an odor," not found in Old English, perhaps cognate with Middle Dutch smolen, Low German smelen "to smolder" (see smolder). OED says "no doubt of Old English origin, but not recorded, and not represented in any of the cognate languages."

Someone should revive smell-feast (n.) "one who scents out where free food is to be had" (1510s, "very common" c.1540-1700, OED) and smell-smock "licentious man" (c.1550-1900). To smell a rat "be suspicious" is from 1540s.