1. To take in hand; to begin to perform; to contract to do; to attempt.

2. To take upon or assume any business or province; to venture; to promise; to be bound.

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

• undertaqke,
• undertand,
• understaken,
• undetake,
• undergae,
• undertakea,
• undertsaken,
• udnertake,
• undertakin,
• undetrtake,
• undrtake,
• undertain,
• underlake,
• understake,
• undertacken,
• underatke,
• understane,
• undertke,
• undertakne,
• undetaken

• under wraps,
• underline,
• underbred,
• undergo,
• undershrub,
• undersealed,
• under way,
• under it,
• undersurface,
• under that,
• underpart,
• underage,
• underskirt,
• underworld,
• undercoat,
• underexpose,
• underspend,
• underived,
• undergrad,
• undercurrent,
• underdone,
• underrate,
• underivative,
• underframe,
• underbelly,
• understate,
• underwater,
• underfur,
• underneath,
• undertaking,
• undercover,
• underclass,
• untier,
• underplay,
• undertone,
• under fire,
• underdress,
• under arms,
• underdrawers,
• underseal,
• underactive,
• underfelt,
• underseller,
• underscore,
• underquote,
• underweight,
• underlie,
• undersell,
• undersea,
• undershot,
• underwear,
• undermine,
• underfed,
• undergird,
• under attack,
• underact,
• underfoot,
• undersized,
• understock,
• undercharge,
• underprice,
• undershirt,
• undoer,
• undershoot,
• underside,
• unweathered,
• undersexed,
• underwrite,
• undertow,
• undercoated,
• undertide,
• undercut,
• understated,
• undersize,
• undervalue,
• underrating,
• understand,
• unadorned,
• understaffed,
• undergarment,
• undertaker,
• underspent.

The adjective form of "undertake" is "undertaken".

The plural form of the word "undertake" is "undertakes"

The singular form of the word "undertake" is "undertakes"