gather together
1. To group together in one place or thing. Gather together in the conference room—Dave will be here in a minute.
2. To group someone or something in one place or thing. In this usage, a noun or pronoun can be used between "group" and "together." Gather the kids together in the playroom, and I'll bring in the cake. I gathered my books together and left the library.
gather someone or something together
to assemble people or things together in one place. Gather every one together in the drawing room for a meeting. Please gather together all the suspects so that they can be questioned again. Would you gather all your papers together and put them away?
gather together
to assemble together. We will gather together on the main deck for a meeting. Let's all gather together this evening and sing.