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enfeeble [enfeebled, enfeebling, enfeebles]▼(make feeble)
verb
[UK: ɪn.ˈfiːb.l̩] [US: en.ˈfiːb.l̩]

loose [loosed, loosing, looses]▼(to unfasten)
verb
[UK: luːs] [US: ˈluːs]

loosen [loosened, loosening, loosens]▼(to make less tight)
verb
[UK: ˈluːs.n̩] [US: ˈluːs.n̩]

relax [relaxed, relaxing, relaxes]▼(to make something less severe or tense)
verb
[UK: rɪ.ˈlæks] [US: rə.ˈlæks]

weaken [weakened, weakening, weakens]▼(to make weaker)
verb
[UK: ˈwiːkən] [US: ˈwiːkən]