半途而廢

to give up halfway (idiom); leave sth unfinished

half / semi- / incomplete / (after a number) and a half

halfway / midway

way / route / road

and / as well as / and so / but (not) / yet (not) / (indicates causal relation) / (indicates change of state) / (indicates contrast)

to abolish / to abandon / to abrogate / to discard / to depose / to oust / crippled / abandoned / waste