Hma:s (Hms) is the verb "to sit" and in this case it is identical with the infinitive due to its use as a gerund (or perhaps as a participle; it's hard to say which based on the ambiguities of Egyptian sentence structure - gerunds and participles are essentially identical and from the context it could mean "I think of myself sitting..." or "I think of sitting..." ).

Xa:r (Xr) under

xiti:u (xt.tjw) - sail

Ha:ru (Hrw) - day

ti:u (tjw) - wind (note that "sail" is a "wind-tree" - xt means "tree" )

So the phrase literally reads:

Sit under sail day wind