un·der·arm
ˌən-dər-ˈärm 
un·der·arm
ˈən-dər-ˌärm
1
2
: the part of a garment that covers the underside of the arm
Examples of underarm in a Sentence
Adverb
He threw the ball underarm.
Recent Examples on the Web
Francesca Krempa, StyleCaster, 4 Oct. 2025
Thankfully, natural deodorants have come a long way, and many have emerged that contain luxurious ingredients that nourish sensitive underarm skin and keep odor at bay.
—Kristen Philipkoski, Forbes.com, 8 Sep. 2025
Francesca Krempa, StyleCaster, 4 Oct. 2025
Focus especially on makeup, sweat, or mildew-prone areas like edges or underarms.
—Daley Quinn, Southern Living, 4 Oct. 2025
See All Example Sentences for underarm
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Adjective
After just a few minutes on each arm, the soreness had noticeably decreased, and my arms looked more defined and less puffy, especially near the underarm area where water retention tends to settle.
—Francesca Krempa, StyleCaster, 4 Oct. 2025
Thankfully, natural deodorants have come a long way, and many have emerged that contain luxurious ingredients that nourish sensitive underarm skin and keep odor at bay.
—Kristen Philipkoski, Forbes.com, 8 Sep. 2025
Noun
After just a few minutes on each arm, the soreness had noticeably decreased, and my arms looked more defined and less puffy, especially near the underarm area where water retention tends to settle.
—Francesca Krempa, StyleCaster, 4 Oct. 2025
Focus especially on makeup, sweat, or mildew-prone areas like edges or underarms.
—Daley Quinn, Southern Living, 4 Oct. 2025
See All Example Sentences for underarm
Cite this Entry
“Underarm.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/underarm. Accessed 18 Oct. 2025.
Copy CitationKids Definition
underarm
1 of 3 adjective
un·der·arm
ˌən-də-ˌrärm
1
: underhand entry 2 sense 2
an underarm toss
2
: placed under or on the underside of the arm
underarm seams
underarm
2 of 3 adverb
un·der·arm
ˌən-də-ˈrärm
: with an underarm motion
underarm
3 of 3 noun
un·der·arm
ˈən-də-ˌrärm
1
: armpit
2
: the part of a garment that covers the underside of the arm
Medical Definition
underarm
noun
un·der·arm
ˈən-dər-ˌärm
: armpit
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