1.
if two people join hands , they hold each other's hands
2.
to work together in doing sth :
Education has been reluctant to join hands with business.
JOIN HANDS (WITH SB)
Meaning of JOIN HANDS (WITH SB) in English
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005