1. To free from tightness, tension, or fixedness; to render less dense; to free from restraint; to open, as the bowels.

2. To become loose; to become less tight or compact.

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

• lesen,
• lissen,
• loosly,
• soosn,
• loossen,
• hosen,
• losson,
• doesen,
• loosese,
• coosen,
• looes,
• loosse,
• litsen,
• losen,
• lowson,
• lisen,
• losens,
• choosen,
• loosin,
• closen

• lessen,
• looser,
• loosens,
• losing,
• loon,
• loxoma,
• loken,
• Loosed,
• loose,
• logan,
• looses,
• loosened,
• louse,
• login,
• Loosing,
• lokken,
• lose.

The adverb form of "loosen" is "loosely".

The adjective form of the word "loosen" is "loose".

The plural form of the word "loosen" is "loosens"

The singular form of the word "loosen" is "loosen".