malgastar
/malɡasˈtaɾ/ · B2 · verb
to waste, to squander, to blow, to fritter away
💸 mal + gastar = badly + spend → to waste
Mal means badly or wrongly, and gastar means to spend. Put together, malgastar is literally to spend badly, which is exactly what wasting or squandering money, time, or resources means. English cousin: malfunction, to function badly.