To complement something means to complete it (the adjective form is complementary). To compliment something (or more often, someone) means to give praise (adjective, complimentary).
![Show submenu Show Submenu](https://scriptor.sprakverkstaden.uu.se/en/wp-content/themes/uu-style/images/more-grey.png)
To complement something means to complete it (the adjective form is complementary). To compliment something (or more often, someone) means to give praise (adjective, complimentary).