"Weighs in" is a common phrase used to describe someone expressing their opinion or offering input on a particular topic. However, there are several synonyms that can be used in place of this phrase when writing or speaking. Some of these synonyms include "chimes in", "adds in", "throws in", "contributes", "opines", "states", "proclaims", "declares", "asserts", "puts forward", and "voices". Each of these words adds a slightly different nuance to the meaning of expressing an opinion or input, allowing for more variety and precision in language use. Using a variety of synonyms can also make writing more engaging and interesting for readers.