"strengthening" in the noun sense
1. strengthening
becoming stronger
2. strengthening
the act of increasing the strength of something
"strengthening" in the verb sense
1. strengthen, beef up, fortify
make strong or stronger
"This exercise will strengthen your upper body"
"strengthen the relations between the two countries"
2. strengthen
gain strength
"His body strengthened"
3. tone, tone up, strengthen
give a healthy elasticity to
"Let's tone our muscles"
Source: WordNet® (An amazing lexical database of English)
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