'Squaw winter' is an old North American phrase for a brief cold snap or early light frost in autumn, before the proper winter arrives. The word 'squaw' is now widely regarded as a slur against Indigenous women in North America and the phrase is being retired from official use — many US place-names containing it have been formally renamed. If your child uses it, gently explain why modern speakers say 'false winter', 'early frost' or 'Indian summer's end' instead. Most teenagers will not have heard it; it is more likely picked up from older relatives, hunting media or a history book.