to concentrate; concentrate; to devote; devote; to apply; apply; to strain; strain; to rack; rack; to freeze; to congeal; freeze; to congeal; to concentrate one's attention on; to devote oneself to something; to ponder; to meditate; concentrate one's attention on; to devote oneself to something; to ponder; to meditate; to concentrate; to focus on; to devote; to apply oneself; concentrate; to focus on; to devote; to apply oneself; to stiffen; to become tense; stiffen; to become tense
