1. (

• investigate ,
• look_into

) investigate scientifically; "Let's investigate the syntax of Chinese" ;

2. (

• check ,
• check_up_on ,
• look_into ,
• check_out ,
• suss_out ,
• check_over ,
• go_over ,
• check_into

) examine so as to determine accuracy, quality, or condition; "check the brakes"; "Check out the engine" ;