To take in; to gather in; to mingle, blend or merge.
To cause or engage (someone or something) to participate or to become connected or implicated.
To comprise or include; to have as a related part.
To complicate or make intricate.
To envelop, enfold, entangle.
To get into pairs; to join together to make a group of two.
To put into pairs; to put into a group of two.