The correct spelling of the phrase "strook head on" is "struck head-on." The word "struck" is a past tense verb, signifying a collision or impact. The phrase "head-on" indicates that the collision happened with the front of two objects or vehicles. The IPA phonetic transcription for "struck" is /strʌk/, with the "u" pronounced as the short "u" sound, and the "ck" ending as a hard "k" sound. "Head-on" is transcribed as /hed ɒn/, with the "ea" in "head" pronounced as the short "e" sound and the emphasis on the second syllable.