css - LESS: Applying a ruleset only when selector is in another selector -

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say i've got:

.apple {     color: red; }

now, let's i've got:

.big {     .apple {         font-size: 1.25em;     } }

is there way can put .big selector inside rule .apple? in psuedocode, like:

.apple {     color: red;      &:[when inside `.big`] {         font-size: 1.25em;     } }

you place & @ end:

.apple {     color: red;      .big & {         font-size: 1.25em;     } }

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