fell wagon (verb) revert: return to an earlier, less-developed condition
Sinonime: active, all ears,
attentive, bright, cagey, careful, clever, good hands, heads up, intelligent,
lively, observant, on guard, on one's toes, on the job, on the lookout, on the stick, perceptive, quick, ready, sharp, spirited, vigilant, watchful, wise, with it
Antonime: develop,
grow,
progress