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1) General subject: co-operate, collaborate, come into line with (с кем-л.), connive (with; тайно; с врагом), contribute, contribute (в газете, журнале), cooperate, have an association, play ball, pull together, work with, play ball (с кем-л.), assist

2) American: (smb.) play ball with (с кем-л.), (smb.) play catch with (с кем-л.)

3) Economy: carry on cooperation, maintain business ties (букв. - поддерживать деловые связи)

4) Politics: achieve cooperation

5) Jargon: play catch with, play ball with

6) Sakhalin energy glossary: work closely (with)

7) Programming: work together

8) Makarov: come into line, cooperate together, contribute to (в газете журнале и т. п.), connive with (с врагом и т. п.), come into line with (с кем-л.)