快点儿
kuàidiǎnr · HSK 2
to do sth more quickly
⏩ 快 kuài (fast) + 点儿 diǎnr (a bit) = a bit faster, hurry up
快点儿 literally stacks 快 (fast) with 点儿, the erhua-softened 一点儿 meaning 'a little bit'. Together they form a colloquial nudge: do it a bit faster — hurry up. The 儿 suffix marks casual northern Mandarin speech.
快 — heart radical 忄 + 夬 (phonetic)
快 is a semantic-phonetic compound. The heart radical 忄 carries the meaning, since the original sense referred to a feeling of pleasure or delight. The right side 夬 supplies the sound. The meaning later extended from 'pleased' to 'quick, fast', the dominant modern sense.
点 — fire radical 灬 + 占 (zhān, phonetic)
Originally written 點, a semantic-phonetic compound: 黑 (black) gave the meaning 'small black mark or dot' while 占 supplied the sound. It first referred to ink spots, then extended to 'point, drop, a little,' and verbs like 'to mark' or 'to light (a fire),' reflected in the simplified form's 灬 (fire) component.