Subrayáis
Subrayáis is the second-person plural present indicative form of the Spanish verb subrayar. Subrayar means to underline, to highlight, or to emphasize. Therefore, subrayáis translates to "you all underline," "you all highlight," or "you all emphasize" when addressing a group of people in a formal or informal context in Spain.
In Spanish grammar, the ending "-áis" is characteristic of the first conjugation verbs (verbs ending in -ar)
The verb subrayar itself is derived from the prefix "sub-" meaning "under" and the Latin word "lineare"