to cause something to become greater in number or quantity

gather or amass something

(to cause people) to gather together

congregate

to collect (information) and arranged in (a book, list, report etc)

assemble, accumulate

to place (things) side by side

place side by side

to become friendly with (a person) after a quarrel

make peace; adjust

(to cause (people)) to form again into groups or into new groups

reorganize, unite

to form (parts) into one; unite

unite