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HYPHEN
COUNT IN NET
WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
THESAURUS
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WORDNET DICTIONARY

Verb strengthen has 3 senses

• strengthen(v = verb.change) beef up, fortify - make strong or stronger; "This exercise will strengthen your upper body"; "strengthen the relations between the two countries"
is one way to alter, change, modify
Derived forms noun strengthener₁, noun strengthening₂
Antonym: weaken
Sample sentences:
Somebody ----s something
Somebody ----s somebody
Something ----s somebody
Something ----s something

• strengthen(v = verb.change) Array - gain strength; "His body strengthened"
is one way to change
Derived form noun strengthening₁
Antonym: weaken
Sample sentences:
Something ----s
Somebody ----s

• strengthen(v = verb.body) tone, tone up - give a healthy elasticity to; "Let's tone our muscles"
is one way to exercise, work out
Sample sentence:
Somebody ----s something

CIDE DICTIONARY

OXFORD DICTIONARY

THESAURUS

strengthen

accelerate, accrue, accumulate, add to, advance, affirm, aggravate, animate, anneal, appreciate, attest, augment, authenticate, back, back up, balloon, be tough, bear out, beef up, bloat, blow up, bolster, boom, boost, brace, brace up, breed, broaden, buttress, case harden, certify, cheer, chirk up, circumstantiate, complicate, concentrate, condense, confirm, consolidate, corroborate, crescendo, deepen, develop, document, double, embolden, encourage, endure, energize, enhance, exacerbate, exaggerate, fortify, gain, gain strength, gelt, get ahead, gird, go up, grow, hang tough, harden, hearten, heat up, heighten, hop up, hot up, increase, inspirit, intensify, invigorate, jazz up, key up, magnify, make complex, mount, multiply, nerve, nourish, nutrify, prepare, probate, proliferate, prop, prove, ramify, ratify, ready, recruit, redouble, refresh, reinforce, reinvigorate, rejuvenate, renew, restrengthen, rigidify, rise, run up, screw up, sharpen, shoot up, shore up, sinew, snowball, soup up, spread, steel, step up, stiffen, substantiate, supplement, support, sustain, swell, temper, tense, tighten, tone up, toughen, trice up, triple, undergird, uphold, validate, verify, vitalize, warrant, wax, whet, widen

ROGET THESAURUS

strengthen

Increase

VB increase, augment, add to, enlarge, dilate, grow, wax, get ahead, gain strength, advance, run up, shoot up, rise, ascend, sprout, aggrandize, raise, exalt, deepen, heighten, strengthen, intensify, enhance, magnify, redouble, aggravate, exaggerate, exasperate, exacerbate, add fuel to the flame, oleum addere camino, superadd, spread.

Power

VB be powerful, gain power, belong to, pertain to, lie in one's power, be in one's power, can, be able, give power, confer power, exercise power, empower, enable, invest, indue, endue, endow, arm, strengthen, compel.

Strength

VB be strong, be stronger, overmatch, render strong, give strength, strengthen, invigorate, brace, nerve, fortify, sustain, harden, case harden, steel, gird, screw up, wind up, set up, gird up one's loins, brace up one's loins, recruit, set on one's legs, vivify, refresh, refect, reinforce, reenforce.

For further exploring for "strengthen" in Webster Dictionary Online