This is the 5742nd most frequent Japanese word.
てらす
"てらす" means "to illuminate" or "to shine on."
Here, 'てらす' (terasu) is used to indicate illumination or lighting up of the garden by the sunlight.
太陽の光が庭をてらしている。
The sunlight is illuminating the garden.
In this sentence, 'てらす' (terasu) is applied metaphorically to mean clarifying or shedding light on something abstract like doubts.
彼の説明は私たちの疑問をてらしてくれた。
His explanation shed light on our doubts.
This use of 'てらす' (terasu) involves physical action to light up a specific area using a flashlight.