← Back to hotbox
Full Level C2+ →
hotbox Etymology Atlas
an overheated axle bearing on a railway car; also an enclosed heated space Pro
Word
Root
Affix
Tap any word to open its Atlas. Pinch to zoom, drag to pan.
hotbox is a Level C2+ word — Pro only
Pro unlocks the Etymology Atlas for levels A2–C2 — plus FSRS-5 spaced repetition, mastery tracking, and the activity dashboard.