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The Chorus in Gaelic:

O gra/dh mo chroidhe mo cru/isci/n,
Sla/inte geal mo mhu/irni/n.
Gra/dh mo chroidhe mo cru/isci/n la/n, la/n, la/n,
O gra/dh mo chroidhe mo cru/isci/n la/n.

was once roughly translated in English as:

O love of my heart, my small jug,
Bright health my darling.
Love of my heart, my full small jug,
O love of my heart, my full small jug.

by Erich Schraer in rec.music.celtic, 1993.
Sheet music here corrects what was in the published book to match the chords used for the song.

    Cruiscin Lan

    by trad
    Let the [Em] farmer praise his grounds
    let the [Am] huntsman praise his [B7] hounds
    let the [Em] shepherd praise his dewy scented [B7] lan
    Oh, but [G] I, more wise than they,
    spend each [C] happy night and [D7] day
    with me [B] darling little cruiscin [Em] lan, lan, lan
    me [B7] darling little cruiscin [Em] lan.

    (Chorus - phonetically)
    Oooooooooooooh,
    [G] Grama crema cruiscin’
    [D7] Slante galmorvorney
    grama crema cruiscin [Em] lan, lan, lan
    Oh, [B7] grama crema cruiscin [Em] lan.

    Immortal and divine, great Bacchus, God of Wine
    create me by adoption your own son
    In hopes that you’ll comply
    that my glass will ne’er run dry
    Nor my darling little cruiscin lan, lan, lan
    Oh, my darling little cruiscin lan.

    (Chorus)

    And when grim death appears in a few but happy years
    You’ll say, “Oh, won’t you come along with me?”
    I’ll say “Begone, you knave! for King Baccus gave me leave
    to take another cruiscin lan, lan, lan
    to take another cruiscin lan.

    (Chorus)

    Then fill your glasses high, lets not part with lips a-dry
    though the lark doth now proclaim it is the dawn
    and since we can’t remain
    may we shortly meet again
    to fill another cruiscin lan, lan, lan
    to fill another cruiscin lan.

    (Chorus)

    X: 67
    T: Crúiscín Lán
    R: reel
    M: 4/4
    L: 1/8
    K:Emin
    Q:120
    B|"Em"(Be)ef g2 fg| "Am"(ag)fe "B7"^d2 zB| "Em"(Be)ef gfg>a| "B7"b6 b2|"G"(bg)gb d'2 c'b| 
    "C"agfg "D7"a2  g>a| "B"(ba)gf b2B2|"Em"(e2f2g2) (ga)|"B7"(ba)gf b2B2| "Em"e6||