sole
US /soʊl/
UK /soʊl/

1.
the undersurface of a person's foot
:
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He had a blister on the sole of his foot.
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She massaged the tired soles of her feet.
2.
the bottom part of a shoe, boot, or slipper, not including the heel
:
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The sole of my shoe has a hole in it.
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These boots have thick rubber soles.
3.
a marine flatfish of the family Soleidae, valued as food
:
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We had grilled sole for dinner.
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The chef prepared a delicate dish of lemon sole.
1.
one and only; single
:
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He was the sole survivor of the accident.
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Her sole purpose was to help others.
1.
to put a sole on (a shoe)
:
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The cobbler will sole my worn-out boots.
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I need to sole these shoes before winter.