1. To sell at a lower price than another.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• undersear,
• undershell,
• undefelt,
• undersal,
• undersel,
• undersael,
• underseel,
• underseale,
• unsersell,
• undersaell,
• unersell,
• undrsell,
• undesell,
• underell,
• underslel,
• undersall,
• underseld,
• underseler,
• underselle,
• undesoil

• underframe,
• undertone,
• underpass,
• undergo,
• underspent,
• undergarment,
• underseal,
• underwater,
• undoer,
• undersealed,
• underlay,
• under wraps,
• underlying,
• undersurface,
• underbred,
• underboss,
• underived,
• undergird,
• unaddressed,
• undertide,
• underpart,
• undermine,
• underplay,
• undersoil,
• underline,
• underling,
• underscore,
• undervalue,
• underbelly,
• underspend,
• undersign,
• underpants,
• underskirt,
• untraversed,
• underside,
• underslung,
• undercurrent,
• undershrub,
• undershoot,
• under fire,
• underwear,
• underworld,
• undersexed,
• untier,
• underdress,
• undershot,
• understated,
• undercover,
• understand,
• underquote,
• undertake,
• understudy,
• understood,
• underwrite,
• undertaker,
• underseller,
• undersized,
• understock,
• understate,
• underage,
• underdone,
• underfelt,
• undershirt,
• under arms,
• underprice,
• Underdahl,
• underdrawers,
• underclass,
• undersea,
• unadorned,
• underhill,
• undersize,
• underlie,
• underexpose,
• underdevelop,
• underfur,
• underrate.

The adverb form of "undersell" is "underselling".

The adjective form of the word "undersell" is "undersold".

The plural form of the word "undersell" is "undersells"

The singular form of the word "undersell" is "underselling"