Allotting is the act of assigning something, whether it's a task, a responsibility or just a certain amount of time. There are several antonyms for this word that vary depending on the context in which it is used. In terms of tasks, the opposite of allotting is collecting or consolidating. Instead of assigning tasks to various team members, the opposite would be to gather all tasks and responsibilities onto one person. Another antonym for allotting is withholding or keeping, which means to not assign or distribute something. In terms of time, the opposite of allotting is wasting, which means to use time without achieving any productive outcome.