cacharro
junk
cachar
to catch (colloquial)
+
-arro
augmentative suffix
A cacharro means junk and can be thought of as a big thing you catch1 (-arro1) when you're catching0 (cachar0) unwanted items.
noun
- junkA useless or old object, often broken or in poor conditionEste coche es un cacharro viejo que apenas funciona. // This car is an old clunker that barely works.