Select the most appropriate ANTONYM of the word 'dwindle' in the sentence given below.

Rahul advised Neerja to appreciate or motivate her younger brother and not to dwindle or neglect his ideas all the time.

complement

The correct answer is option 2. complement.

"Dwindle" means to diminish or decrease gradually in size, amount, or strength. In the context of the sentence provided, it suggests not to diminish or neglect her younger brother's ideas all the time. Therefore, the antonym "complement" fits best, as it means to enhance or complete something by adding to it, which aligns with the advice to appreciate or motivate her younger brother's ideas.