卡
kǎ , qiǎ · HSK 2
to stop
💳🚧 卡 = 上 + 下 stuck between up and down — wedged, blocked, or a card
The character stacks 上 (up) over 下 (down), so something is jammed between them — hence to block or get stuck. The 'card' sense came later via the English loan 'card' (kǎ), since cards slot or wedge into slots.
卡 — 上 (up) + 下 (down)
卡 is a modern compound formed by stacking 上 'up' on 下 'down', visually depicting something stuck between two positions — neither up nor down. From this 'wedged' image come its core meanings: to block, to get stuck, and a checkpoint or card. The reading kǎ also transcribes foreign words like 'card', while qiǎ keeps the older 'pinch/stuck' sense.